I posted image 60707 a couple days back and only now see its got extra limb that I somehow missed despite it being rather front and center. I would like to replace that one with a better version sticking with a more traditional 4 legs, (instead of 5)
I do see a replacements in the history section, but don't know how this works, before posting the new one or doing other dumb things; How does this work? I did look over the wiki but didn't seem to see anything relevant to my question.

Only mods and admins can use the Replacement functions.
Us ordinary users simply need to upload the fixed version, and flag the older post as inferior to it. After some time the mods will remove the old flagged post